Introducing Arcserve Backup Agents and Options › Using Agents › Agent for Virtual Machines › Troubleshooting › Mount Operation Problems › Cannot Open VMDK File

Cannot Open VMDK File

Valid on Windows platforms.

Symptom

Multiple concurrent backup jobs fail in NBD (or LAN) transport mode. The following message appears in the Activity Log:

Cannot open VMDK File 

Solution

This is a VMware connection limitation. The following Network File Copy (NFC) protocol limits apply:

• ESX 4: 9 direct connections, maximum
• ESX 4 through vCenter Server: 27 connections, maximum
• ESXi 4: 11 direct connections, maximum
• ESXi 4 through vCenter Server: 23 connections, maximum

Connections cannot be shared across disks. The maximum limits do not apply to SAN or hotadd connections. If the NFC client fails to shut down properly, connections can remain open for ten minutes.